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PI3Kdelta inhibitor 1 (Compound 5d) is a potent, selective and orally available PI3Kδ inhibitor with an IC50 of 1.3 nM[1]. PI3Kδ|1.3 nM (IC50)

[1]. Hamajima T, et al. Optimization and in vivo evaluation of pyrazolopyridines as a potent and selective PI3Kδ inhibitor. Bioorg Med Chem. 2018 Aug 7;26(14):3917-3924.